to her over the past four years as they focused their energies on president obama. that clearly ended yesterday. clinton began her testimony with a rare public expression of emotion, talking about the deaths of ambassador chris stevens and three other americans in benghazi. >> for me, this is not just a matter of policy. it's personal. i stood next to president obama as the marines carried those flag-draped caskets off the plane at andrews. i put my arms around the mothers and fathers, the sisters and brothers, the sons and daughters, and the wives left alone to raise their children. >> but through most of the day, she was forceful, even combative, when she felt she needed to be, jousting with republican critics, including wisconsin senator ron johnson. >> we were misled, that there were supposedly protests and then something sprang out of that. >> with all due respect, the fact is we had four dead americans! was it because of a protest?! or was it because of guys out for a walk one night who decided they'd go kill some americans?! what difference, at this point, does it make?! it is